<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<canvas id="yuan">
			
		</canvas>
		<script type="text/javascript">

			var c=document.getElementById("yuan");
			var cxt=c.getContext("2d");
			cxt.fillStyle="red";
			cxt.beginPath();
			cxt.arc(100,100,50,0,Math.PI*2);
	      
			cxt.closePath();
			cxt.fill();

		</script>
	</head>
	<body>
		

	</body>
</html>
